STANDARD PENETRATION TEST (SPT) CORRECTION

The Standard Penetration Test (SPT) is currently the most popular in-situ test in obtaining subsurface information. Although great effort has been put into standardizing the SPT procedure, variability is inherent in present procedures. Research has shown that the most significant factor affecting the measured N values is the amount of energy delivered to the drill rods. In order to reduce the significant variability of the SPT N values due to the large variation in energy delivered, it has been recommended that the N value be standardized to a specific energy level through the use of correction factors. The purpose of this research is to summarize all available correction factors and, with the guidance of a limited field-testing program, determine the most appropriate correction factor. This report documents a field testing program in which energy delivered by three different hammer systems, one donut, one safety, and one automatic, were measured. The resulting data are presented as well as conclusions regarding the determinations and use of correction factors in correcting the SPT N value.

• Record URL:
  https://onlinepubs.trb.org/onlinepubs/trispdfs/00929164.pdf
• 
• Corporate Authors:

  University of Maryland, College Park

  Department of Civil and Environmental Engineering
  College Park, MD  United States  20742

  Maryland Department of Transportation

  State Highway Administration, 707 N Calvert Street
  Baltimore, MD  United States  21202
• Authors:
  • Aggour, M S
  • Radding, W R
• Publication Date: 2001-9-30

Language

• English

Media Info

• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 93 p.

Subject/Index Terms

• TRT Terms: Energy; Field tests; Hammers; Measurement; Penetration resistance; Soil penetration test; Standardization; Variables
• Uncontrolled Terms: Correction (Mathematics)
• Subject Areas: Energy; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00929164
• Record Type: Publication
• Report/Paper Numbers: MD02-007B48,, Final Report
• Contract Numbers: SP007B48
• Files: TRIS, STATEDOT
• Created Date: Aug 9 2002 12:00AM